JP2003278130A - Revetment structure and revetment construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a revetment structure having a sufficiently rigid structure while using sediment as a main constituent element and to provide a revetment construction method. <P>SOLUTION: This revetment structure 10 constructed on a slope and having a sediment layer is composed of a reinforcing net 11 positioned in at least high position and a low position of the sediment layer 12 and a restraint tool 20 restraining the sediment layer 12. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a revetment structure and a revetment construction method for the purpose of protecting a slope.

[0002]

2. Description of the Related Art As a conventional revetment method for rivers,
Various proposals have been made for the block mat construction method, natural stone-clad construction method, gabion construction method, basket mat construction method, block-clad construction method, connecting block construction method, and the like. In particular, in the revetment method in rivers with fast flow velocity, hard materials such as natural stone and concrete blocks are constrained to a rigid body, and the slope is held down by the weight.
It is considered desirable to design so that the flow velocity can be reduced due to the roughness of the surface.

Further, as a construction method using earth and sand as a constituent material of a revetment structure, Japanese Patent Application No. 9-322837 (Japanese Unexamined Patent Publication No. Hei.
1-158874). In this method, a plastic mesh is laid on the slope, the sand is covered on the mesh as a filling material, the mesh is rolled up from the tip, and the sand is surrounded by the mesh. The purpose is to prevent the revetment structure from slipping off the slope by integrating the filling soil.

[0004]

[Problems to be Solved by the Invention] The above-mentioned revetment method for rivers has the following points to be improved. <B> In the above-mentioned conventional construction method, basically all of the constituent members are purchased from other than the local site, and it is difficult to effectively use the locally generated sediment, and it is also difficult to restore and grow the vegetation. <B> Since the revetment structure is rigid, its followability is poor even with respect to erosion damage and scouring damage on river banks and river beds. <C> It is difficult to use earth and sand as the filling material of the revetment structure because the use of the sediment as the filling material of the revetment structure flows out from the revetment structure due to the influence of water flow. <D> The use of earth and sand as the filling material of the revetment structure inevitably causes flow in the structure due to the nature of the earth and sand, and it is difficult to form a rigid structure required for the revetment structure. For this reason, when constructing on a slope that is long in the height direction, it is necessary to divide the construction into multiple layers, which requires time and labor.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a revetment structure and a revetment method having a sufficient rigid structure while using earth and sand as a filling material. To do.

[0006]

In order to achieve the above-mentioned object, the present invention is a revetment structure constructed on a slope and having a sediment layer, which is located at least above and below the sediment layer. A revetment structure comprising a reinforcing net and a restraint jig for restraining the sediment layer. In the present invention, the restraint jig is a rod-shaped member that penetrates the earth and sand layer and the lower reinforcement net from the upper surface of the reinforcement net positioned higher than the earth and sand layer,
One end of the restraint jig has a bulged portion formed so as to be hooked on the upper reinforcement net, and the other end is formed with a spiral ridge formed so as to be hooked by being screwed into the opening of the lower reinforcement net. The present invention also provides the revetment structure described above, wherein a guide edge is formed at the other end of the tightening jig. In the present invention, the tightening jig includes a support plate located between the slope and the reinforcing net, a bolt extending from the support plate to the surface of the seawall structure, and a fastening corresponding to the bolt. There is provided a revetment structure as described above, characterized in that it is composed of a member. Further, the present invention provides the revetment structure described above, wherein the earth and sand layer is divided by a net belt.

The present invention is also a revetment construction method for constructing a revetment structure on a slope, in which a reinforcing net is laid on the slope,
Unwinding earth and sand on the reinforcing net to form a earth and sand layer,
After winding the earth and sand layer by the reinforcing net, screw the restraint jig into the earth and sand layer from above the upper reinforcing net until reaching the earth and sand layer and the lower reinforcing net, and between the upper reinforcing net and the lower reinforcing net. To provide a revetment construction method, which is characterized by constructing a revetment structure that is restrained so that the flow of earth and sand can be restrained. The present invention is also a revetment construction method for constructing a revetment structure on a slope, which has a bolt portion extending in the front direction of the revetment structure to be constructed and having a bolt portion formed longer than the layer thickness length of the revetment structure. Placing the plate on the slope, laying a reinforcing net, unwinding the earth and sand on the reinforcing net to form a layer of earth and sand, and winding so that the reinforcing net is located on the upper surface of the earth and sand layer, and then the upper layer It is characterized by constructing a seawall structure in which fastening members are fastened to the bolts of the support plate protruding above the reinforcing net to restrain the flow of earth and sand between the upper reinforcing net and the lower reinforcing net. Provides a revetment method. Further, the present invention is a revetment construction method for constructing a revetment structure on a slope,
A support plate having bolts extending in the front direction of the revetment structure to be constructed and having a length longer than the layer thickness of the revetment structure is arranged on the slope, a reinforcing net is laid, and a net strip is provided between the bolts. The bolts of the support plate that are laid over and wound up so that the earth and sand are unwound onto the reinforcing net to form a earth and sand layer, and that the reinforcing net is positioned on the upper surface of the earth and sand layer, and then project onto the upper reinforcing net. A seawall construction method characterized by tightening a fastening member to restrain the flow of earth and sand between the upper reinforcing net and the lower reinforcing net.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective explanatory view of a revetment structure and a revetment construction method according to the present invention.

<B> Basic Structure The revetment structure 10 of the present invention is a revetment structure having a sediment layer 12 constructed on a slope 60, and a reinforcing net positioned at least above and below the sediment layer 12. 11 and
A revetment structure 10 comprising a restraining jig 20 for restraining the earth and sand layer 12. Hereinafter, each component will be described separately.

<B> Reinforcing Net The reinforcing net 11 is a member for restraining the earth and sand layer by rolling it up. The upper reinforcing net 11b and the lower reinforcing net 11a indicate portions of the reinforcing net 11 located above and below the sediment layer 12, respectively, and the upper reinforcing net and the lower reinforcing net are continuous. It is a member of. As the reinforcing net 11, a mesh-shaped net material having excellent tensile strength and flexibility is used. For example, geotextiles such as woven fabrics (plain weave, multiple weave, etc.), knits (no-knot knitting, Russell knitting, etc.), non-woven fabrics, etc., or geogrids such as resin extruded products or composites of fibers and resin extruded products can be used.

<C> Restraint Jig FIG. 3 shows an explanatory view of the restraint jig. The restraint jig 20 is a member intended to reliably prevent the earth and sand layer 12 from moving vertically between the upper reinforcing net 11b and the lower reinforcing net 11a. The restraint jig 20 has a rod-shaped rod portion 21 and a bulging portion 22 formed at one end of the rod portion 21 so as to be hooked on the upper reinforcing net 11b, and at the other end, a lower reinforcing net 11a. The opening 111
It is characterized in that it is composed of a spiral projection 23 screwed into a so as to be hooked, and a guide edge 25 is formed at the other end of the rod portion 21. The restraint jig 20 is integrally formed of a rigid material such as metal or resin.

The rod portion 21 is set to have a cross-sectional size that can be inserted into the openings 111a of the upper reinforcing net 11b and the lower reinforcing net 11a, and its total length is set to be substantially equal to the layer thickness of the earth and sand layer 12.

The bulging portion 22 is formed in such a size that it cannot penetrate the openings 111a of the upper reinforcing net 11b and the lower reinforcing net 11a and can be hooked on the upper reinforcing net 11b.
Further, the bulging portion 22 is formed in a shape such as a polygon which can apply a rotational force to the restraining jig 20 from the outside. A collar 26 may be formed below the bulging portion 22 if necessary.

The spiral ridge 23 is a portion that allows the restraining jig 20 to penetrate into a deep portion of the earth and sand layer 12 by turning in the penetrating direction. The spiral ridge 23 is a self-perforating blade formed in a spiral shape over a certain length from the end of the rod portion 21, and its outer shape is gradually reduced toward the tip of the rod portion 21. The minimum diameter of the spiral projection 23 is equal to or slightly smaller than the openings 111a and 111b of the upper reinforcing net 11b and the lower reinforcing net 11a, and the maximum diameter thereof is the upper reinforcing net 11b and the lower reinforcing net. The net 11a is formed to be larger than the openings 111a and 111b.

The guide edge 25 connects the restraint jig 20 to the opening 1 of the upper reinforcing net 11b and the lower reinforcing net 11a.
This is a portion for facilitating the alignment with 11a and 111b. The guide edge 25 is formed by cutting the end portion of the rod portion 21 in half and notching a part of the edge portion.

Next, a revetment method for constructing the revetment structure will be described. FIG. 1 is a perspective explanatory view of the seawall construction method, and FIG. 2 is an explanatory view of the laying process of the auxiliary net 11 and the forming process of the earth and sand layer 12. This construction method is a revetment construction method for constructing a revetment structure on a slope 60, in which a reinforcement net 11 is laid on the slope 60, and earth and sand are unwound on the reinforcement net 11 to form a sediment layer 12. After the earth and sand layer 12 is wound by the reinforcing net 11, the restraint jig 20 is screwed into the earth and sand layer from above the upper reinforcing net 11b until reaching the earth and sand layer 12 and the lower reinforcing net 11a. The revetment construction method is characterized by constructing the revetment structure 10 in which the flow of earth and sand between the lower reinforcement net 11a and the lower reinforcement net 11a is restrained. Hereinafter, each step will be described separately.

<A> Laying Reinforcing Net The reinforcing net 11 is laid on the slope 60 that constructs the revetment structure 10 by leveling. The reinforcing net 11 has a length that is at least twice the normal length of the slope 60 and is of a size that allows the soil layer to be formed later to be wrapped (wrapped).

<B> Reinforcement work and crown protection work First, the revetment work is carried out for the purpose of preventing scouring of the legs of the revetment structure 10 on the riverbed.
Carry out the crown protection work to protect the crown of No. 0. For root consolidation and crown protection, generally-used work types such as work earthwork, root block work, stuffing work, sunk work, rubble work, basketwork, etc. are appropriately selected and implemented. In this example,
For example, a futon basket 13 filled with natural stones is installed in a net formed in a box or bag.

<C> Formation of earth and sand layer The earth and sand or the like is sprinkled on the auxiliary net 11 and compacted by compaction to form the earth and sand layer 12 having a predetermined layer thickness. As the earth and sand used here, the earth and sand generated locally can be used by cutting the slope 60 that constructs the revetment structure 10.

A surface treatment material 14 is laid on the upper surface of the earth and sand layer 12 for the purpose of preventing the earth and sand from being sucked out. Surface treatment material 14
As the material, a net material or a non-woven fabric having a mesh of 1 to 10 mm is used, but any other sheet material may be used as long as it is a sheet material capable of preventing the suction of earth and sand.

<D> The wrapping process reinforcement net 11 is provided with the futon basket 1 at the top end and the root consolidation part.
3 and 13 and the upper surface of the earth and sand layer 12 are rolled up and wrapped. Whether the side surface of the earth and sand layer 12 is left exposed or whether the side surface is closed to form a bag is appropriately selected.

<E> Introduction of Prestress The restraint jig 20 introduces prestress between the upper and lower reinforcing nets 11b and 11a with respect to the sediment layer 12 to restrain the sediment layer 12 from above and below.
The introduction of prestress is performed at a plurality of points with a predetermined interval. First, while rotating the restraint jig 20 in the penetrating direction, the front end side of the rod portion 21 is screwed in from the opening of the upper auxiliary net through the earth and sand layer 12 until reaching the lower reinforcing net 11a.
Here, as shown in FIG. 4, even if the center of the restraint jig 20 is deviated from the center of the opening 111a of the lower reinforcing net 11a, the restraint jig 20 is rotated to rotate the rod portion 21.
The semi-cylindrical portion 24 at the tip enters the opening 111a, and the guide edge 25 contacts the lower reinforcing net 11a. By further rotating the restraint jig 20, as shown in FIG.
As shown in FIG.
The center of the restraint jig 20 and the center of the opening 111a coincide with each other by rotating around the contact point with a as a fulcrum (FIG. 6).

By continuing to rotate the restraint jig 20, the tip of the restraint jig 20 penetrates into the inside of the slope 60. Then, since the restraint jig 20 is formed to have a length substantially equal to the sediment layer 12, the restraint jig 20 tries to penetrate the sediment layer 12, but the bulging portion 22 of the restraint jig 20 prevents the upper reinforcement net 11b from penetrating. Prestress is introduced. As a result,
The upper and lower surfaces of the earth and sand layer 12 are packed and constrained, and the revetment structure 10 having a rigid structure with high shear strength can be obtained.

The movement of the sediment forming the sediment layer 12 is blocked by the mesh structure in the horizontal direction,
The vertical direction is blocked by the prestress introduced by the restraint jig 20.

Further, since the tip of the restraint jig 20 penetrates into the inside of the slope 60, it also functions as an anchor member for fixing the revetment structure 10 to the slope 60.

The method of introducing prestress in the present invention is not limited to this embodiment, and for example, a rope material is used to sew between the upper reinforcing net 11b and the lower reinforcing net 11a. It is possible to adopt a method of restraining various sediment layers 12, such as introducing stress.

<F> About vegetation revetment structure 10 When not only natural vegetation due to rich inflow sediment from the upstream of the river but also vegetation is actively promoted, the upper surface of the revetment structure 10 is covered with 0 to 20 cm of soil. You may install Zhang Shibako. Alternatively, a vegetation sheet or a vegetation mat in which seeds, various fertilizers and the like are formed into a sheet by a non-woven fabric or the like may be polymerized and laid between the earth and sand layer 12 and the upper reinforcing net 11b (not shown).

[0028]

Embodiment 2 In the present embodiment, the restraint jig in the above-mentioned Embodiment 1 is obtained by using a support plate 41 located between the slope 60 for constructing the revetment structure 10 and the reinforcing net 11. From the support plate 41 to the revetment structure 1
It is characterized by comprising a bolt 43 extending to the surface of 0 and a fastening member 45 corresponding to the bolt 43.

FIG. 7 shows an explanatory view of the restraint jig according to the present embodiment. The support plate 41 is a member that supports a bolt 43 for introducing prestress described later. The support plate 41 is formed of a strip-shaped plate, forms a nut portion 42 for inserting a bolt 43 for introducing prestress at predetermined intervals, and forms a hole portion 46 that enables connection between the support plates 41. To form. The nut portion 42 is integrated with the support plate 41 by a commonly used method such as welding or adhesion. The hole 46 is formed to have a diameter that allows the nut 42 to be fitted therein. The support plate 41 is the revetment structure 10
It is advisable to form the sloping surface 60 with a plurality of dimensions so as to correspond to the installation range of the slope 60.

The bolt 43 has a diameter whose openings 111a, 1a in the upper reinforcing net 11b and the lower reinforcing net 11a.
A slicing bolt 43 smaller than 11b and formed corresponding to the nut portion 42 of the support plate 41 is used. The overall length of the bolt 43 is at least approximately equal to the layer thickness of the earth and sand layer 12. In this example, the support plate 41 and the bolt 43 are integrated by screwing the bolt 43 into the nut portion 42 of the support plate 41. However, the bolt 43 is previously integrated into the nut portion 42 of the support plate 41. You may form.

Next, a revetment construction method for constructing the revetment structure 10 according to the present embodiment will be described. This construction method is a revetment construction method for constructing a revetment structure on a slope, which extends in the surface direction of the constructed revetment structure 10 and has a bolt 43 formed to be longer than the layer thickness of the revetment structure 10. The plate 41 is arranged on the slope, the reinforcing net 11 is laid, the earth and sand are unwound onto the reinforcing net 11 to form the earth and sand layer 12, and the upper surface of the earth and sand layer 12 is wound so that the reinforcing net 11 is located. After that, the fastening member 4 is attached to the bolt 43 of the support plate 41 protruding above the upper reinforcing net 11b.
It is a revetment construction method characterized by constructing a revetment structure 10 in which 5 is tightened to restrain the flow of earth and sand between the upper reinforcement net 11b and the lower reinforcement net 11a. In this construction method, the steps other than the step of installing the restraint jig 40 and the prestress introduction step are the same as those of the revetment construction method described in the first embodiment of the present invention, and therefore description thereof is omitted.

<A> Installation of Restraint Jig The support plate 41 constituting the restraint jig 40 is installed between the slope 60 for constructing the revetment structure 10 and the lower reinforcement net 11a, and the support plate 41 is placed at a predetermined position. Then, a pin is driven in or fixed to the slope 60 using an adhesive. That is,
The support plate 41 is installed before the lower reinforcing net 11a is laid on the slope 60. The plurality of support plates 41 are installed in combination in a grid pattern. As shown in FIG. 7, the support plates 41 are assembled with each other by fitting the nut portion 42 of one support plate 41 and the hole portion 46 of the other support plate 41. The male screw of the bolt 43 is screwed into and attached to the female screw of the nut portion 42 of the support plate 41.

A lower reinforcing net 11a is laid above the support plate 41, and the earth and sand layer 1 is placed on the lower reinforcing net 11a.
2 is formed, and the upper reinforcement net 11 is formed on the upper surface of the sediment layer 12.
Since the step of laying b is the same as the step in the first embodiment, the description thereof will be omitted.

<B> Introduction of Prestress The fastening member 45 is screwed into the tip of the bolt 43 protruding upward from the opening 111b of the upper reinforcing net 11b.
A nut corresponding to the bolt 43 is suitable as the fastening member 45, and the nut is also used in this example, but any other member capable of imparting a fastening force can be substituted. At this time, when the plate 44 having a larger area than the opening 111b of the reinforcing net and having the hole portion 46 through which the bolt 43 can be inserted is inserted between the fastening member (nut) 45 and the upper reinforcing net 11b, the nut 45 is inserted. It is effective because the fastening force can be transmitted more.

The restraint jig 40 is pre-stressed by tightening the fastening member (nut) 45 even after the fastening member (nut) 45 is hooked on the upper reinforcing net 11b, and tightens the earth and sand layer 12 from the upper and lower surfaces. Similarly, a fastening member (nut) 45 is screwed into the tip end portion of the bolt 43 protruding at a predetermined position to restrain the earth and sand layer 12, and thus the seawall structure 10 having high shear strength.
Can be built.

According to the revetment structure 10 according to the present embodiment, the prestress can be efficiently dispersed and transmitted without being concentrated at the introduction point by the support plate 41 assembled in a cross beam shape, so that the first embodiment described above is adopted. Revetment structure 10
In addition to exhibiting higher rigidity, the reinforcing net 11 does not need to have higher rigidity than in the first embodiment. For this reason, various geotextiles such as weaving, knitting, and resin extrusion can be used.

In this example, the case where the support plates 41 are arranged in a cross beam shape has been described, but the present invention is not limited to this, and the support plates 41 are arranged in a river shape at predetermined intervals. Combinational arrangements can be employed.

[0038]

[Third Embodiment of the Invention] In the third embodiment, the restraint jig of the second embodiment is obtained by using a supporting plate 41 positioned between the slope 60 for constructing the revetment structure 10 and the reinforcing net 11. From the support plate 41 to the revetment structure 1
It is composed of a bolt 43 extending to the surface of 0 and a fastening member 45 corresponding to the bolt 43, and the mesh layer 50 is hung over the bolt 43 to divide the earth and sand layer. Is. The configuration and process other than the division of the sediment layer in the revetment structure and the revetment construction method are the same as the configuration and process in the first embodiment or the second embodiment of the invention, and thus the description thereof will be omitted.

FIG. 8 shows an explanatory plan view of the arrangement relationship of the restraint jigs in this embodiment. The section of the earth and sand layer is composed of a support plate 41 formed in the shape of a strip plate, bolts 43 (posts) provided upright on the support plate 41, and a net strip body 50. The support plate 41 and the bolt 43 are the same members as those explained in the explanation 2 of the above-mentioned embodiment, so that the explanation thereof will be omitted. As the mesh belt body 50, a mesh-shaped net material having excellent tensile strength and flexibility is formed into a strip shape. Further, in this example, a construction example in which the sediment layer is divided into staggered patterns will be described, but the present invention is not limited to this, and by selecting the arrangement of the support plate 41 and the bolts 43, a cross beam shape, a honeycomb shape, etc. It can be classified in various forms.

[0040] Rooting work and crown protection work were carried out, and slope 6
A support plate 41 in which a plurality of bolts 43 (supports) are erected on the 0 is installed at a predetermined interval. Next, the reinforcing net 11 is laid.

The support plate 41, as shown in FIG.
The mesh strip 50 is hung vertically on the vertically-arranged bolts 43 (posts) and arranged so as to form a zigzag shape.
Fixed by. Adjacent net strips 50, 50 are coils 5.
Connect and fix with 1.

The earth and sand are sprinkled out to form an earth and sand layer having a predetermined thickness. Reinforcement net 11 for root consolidation (futon basket 1
3), the earth and sand layer 12 and the top portion (futon basket 13) are rolled up and wrapped in a sandbag shape. Upper reinforcement net 11b
The seawall structure according to the present embodiment can be constructed by screwing the fastening member 45 (nut) into the tip of the bolt 43 protruding above the opening 111b to introduce prestress.

According to the revetment structure according to the present embodiment,
By dividing the earth and sand layer 12 without sacrificing continuity and integrity by the net belt body 50, compared to the case where the earth and sand layer 12 is restricted only by the upper reinforcing net 11b and the lower reinforcing net 11a, It is possible to prevent the flow of earth and sand more strongly than the strip 50. As a result, it is possible to provide a revetment structure having a stronger rigid structure.

[0044]

Since the present invention is as described above, the following effects can be obtained. <B> Not only the horizontal flow of the sediment layer but also the vertical flow is restrained, and a rigid revetment structure can be provided while using earth and sand as a constituent element of the revetment structure. <B> Since the restraint jig also functions as an anchor for the seawall structure, it can be sufficiently integrated with the slope without separately placing an anchor. <C> Since it is basically a flexible revetment structure, it can be maintained following erosion and scour of river bank bodies and river beds. <D> Since the locally generated sediment can be used when forming the sediment layer, it is possible to effectively utilize the locally generated sediment. <E> Prevention of erosion and sucking out by installing a surface treatment material,
Good vegetation recovery and vegetation can be achieved. <F> Since the vegetation adheres to the mesh or net-like reinforcing material to increase the surface roughness, the effect of reducing the nearby flow velocity can be exhibited.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view of a revetment structure and a revetment construction method according to the present invention.

[Fig. 2] An explanatory view of a process of laying an auxiliary net and a process of forming a sediment layer

FIG. 3 is an explanatory view of a restraint jig according to the first embodiment of the invention.

FIG. 4 is an explanatory view of alignment of a restraint jig and a reinforcing net.

5 is an arrow view of VV in FIG.

FIG. 6 is an explanatory view of a state in which a reinforcing net and a spiral protrusion of a rod portion of a restraint jig are hooked.

FIG. 7 is an explanatory view of a restraint jig according to a second embodiment of the invention.

FIG. 8 is an explanatory plan view of an arrangement relationship of restraint jigs according to a third embodiment of the invention.

[Explanation of symbols]

10 ・ ・ ・ ・ ・ ・ Revetment structure 11 ... Reinforcing net 11a .... Reinforcing net at the lower level 11b ・ ・ ・ ・ ・ ・ Higher-order reinforcement net 111a, 111b and opening 12 ・ ・ ・ ・ ・ ・ Soil layer 13 ... Futon basket 14 ... Surface treatment material 20 ... Restriction jig 21 ・ ・ ・ ・ ・ ・ Rod part 22 ・ ・ ・ ・ ・ ・ Swelling part 23 ... Spiral protrusion 24 ・ ・ ・ ・ ・ ・ Semi-cylindrical part 25 ... Guide edge 26 ... 40 ・ ・ ・ ・ ・ ・ Restraint jig 41 ・ ・ ・ ・ ・ ・ Support plate 42 ... Nut part 43 ... Bolt 44 ... Plate 45 ・ ・ ・ ・ ・ ・ Fastening member (nut) 46 ... hole 47 ... Pin 50 ・ ・ ・ ・ ・ ・ Net band

Claims (7)

[Claims] 1. A revetment structure constructed on a slope and having a sediment layer, comprising a reinforcing net positioned at least above and below the sediment layer, and a restraining jig for restraining the sediment layer. A revetment structure characterized by this. 2. The restraint jig is a rod-shaped member that penetrates the earth and sand layer and the lower reinforcement net from the upper surface of the reinforcement net located above the earth and sand layer, and is attached to one end of the restraint jig. Has a bulge formed so that it can be hooked on the upper reinforcement net, and at the other end is a spiral ridge that can be hooked by being screwed into the opening of the lower reinforcement net. The revetment structure according to claim 1, wherein a guide edge is formed on the other end of the revetment. 3. The tightening jig includes a support plate located between the slope and the reinforcing net, a bolt extending from the support plate to the surface of the seawall structure, and a fastening member corresponding to the bolt. The revetment structure according to claim 1, characterized by comprising: 4. The revetment structure according to claim 1, wherein the sediment layer is divided by a net belt. 5. A revetment method for constructing a revetment structure on a slope, wherein a reinforcing net is laid on the slope, and earth and sand are unwound on the reinforcing net to form a sediment layer, and the earth and sand are formed by the reinforcing net. After winding the layer, screw the restraint jig into the sediment layer from above the upper reinforcement net until reaching the sediment layer and the lower reinforcement net,
The revetment method is characterized by constructing a revetment structure that restrains the flow of sediment between the upper reinforcement net and the lower reinforcement net. 6. A revetment construction method for constructing a revetment structure on a slope, the support plate having a bolt portion extending in the front direction of the revetment structure to be constructed and longer than the layer thickness of the revetment structure. On the slope, laying a reinforcing net, unwinding earth and sand on the reinforcing net to form a sand layer, and winding so that the reinforcing net is located on the upper surface of the earth and sand layer, and then reinforcing the upper layer. It is characterized in that a fastening member is tightened to the bolt of the support plate protruding above the net, and a revetment structure is constructed to restrain the flow of earth and sand between the upper reinforcing net and the lower reinforcing net. Revetment method. 7. A revetment method for constructing a revetment structure on a slope, comprising a support plate having bolts extending in the front direction of the revetment structure to be constructed and having a length longer than the layer thickness of the revetment structure. Arranged on a slope, laying a reinforcing net, straddling a mesh belt between the bolts, unwinding earth and sand on the reinforcing net to form a sediment layer, and the reinforcing net is located on the upper surface of the sediment layer After being wound up, the fastening member is tightened to the bolt of the support plate protruding above the upper reinforcing net, and the flow of earth and sand between the upper reinforcing net and the lower reinforcing net is restrained. , Revetment method.